√3 cos40°+sin40°/sin40°cos40°
问题描述：
√3 cos40°+sin40°/sin40°cos40°
答
(√3 cos40°+sin40°)/(sin40°cos40°)=4(√3/2* cos40°+1/2 *sin40°)/(2sin40°cos40°)=4(sin60° * cos40°+cos60° *sin40°)/(2sin40°cos40°)=4sin(60°+40°)/sin80°=4sin100°/sin80°=4sin80°/sin80...